First off, I would get a Pokémon with Swift Swim. Barraskewda works well due to its great Speed, allowing it to outspeed a lot when rain is up. Here’s the set I would use:
Barraskewda @ Life Orb
Ability: Swift Swim
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Close Combat
- Liquidation
- Psychic Fangs / Drill Run / Ice Fang
- Poison Jab / Drill Run / Ice Fang
You don’t need Jolly due to its raw speed + EVs + Swift Swim, so Adamant for the power boost is preferred. Life Orb increases the power of your moves as well. Close Combat is coverage, Liquidation is STAB, Psychic Fangs takes down screens, Drill Run for Electric types, or Ice Fang for Grass types. Poison Jab covers Fairy types, and, again, the same coverage moves.
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Next I would get a Thunder user. In chat you said Jolteon, so I’ll post a Jolteon set here. With great speed and Special Attack, as well as access to Volt Switch, it can finish off weakened foes quite well on a Choiced set.
Jolteon @ Choice Specs / Choice Scarf
Ability: Volt Absorb
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Hidden Power [Ice]
- Volt Switch
- Thunder
- Shadow Ball / Signal Beam
With the ability to safely switch into electric attack due to Volt Absorb, this set works pretty nice on a rain team. Choice Specs allow you to hit as hard as possible. A Choice Scarf can be used if you’re worried about not outspeeding other Pokémon, such as ones that use Scarfs theirselves. Timid gives you a speed boost. HP Ice hits Grass types for your team, as well as Dragon and Ground types. Thunder has perfect accuracy in the rain, and it’s more powerful than Thunderbolt, while also having a higher chance to paralyze the opponent. The last move is coverage, it’s your choice.
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Now that the offensive part has been taken care of, I think Ludicolo would fit this team. Rain Dish + Leftovers heals quite a lot in the rain. I wouldn’t make it a Swift Swim + Life Orb sweepers due to this team being pretty offensive already.
Ludicolo @ Leftovers
Ability: Rain Dish
EVs: 252 HP / 228 Def / 28 SpA
Bold Nature
IVs: 0 Atk
- Scald
- Giga Drain
- Leech Seed
- Protect
Pretty annoying, if you ask me. Leftovers + Rain Dish + Leech Seed heals 1/4 of your HP every turn, assuming that it’s raining (1/16 from Leftovers + 1/16 from Rain Dish in the rain + 1/8 from Leech Seed, so 4/16). The EVs allow it to be more bulky on the physical side. Max HP is for all around bulk, but 228 Def is to increase its mediocre Physical Defense. I saved some EVs for Special Attack, just so you can get more damage off. Bold increases Defense, and lowers its unused Attack. Scald is for the burn chance, and it should do decent damage in the rain. Giga Drain is to annoy your opponent more by taking chunks of their HP while healing yourself. Leech Seed heals you and damages your opponent every turn. Protect is so you can safely heal yourself.
Messed up the calcs. For Leech Seed, it’s 1/8 of the opponents max HP, so it wouldn’t be 1/4. Oops.
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Now a hazard setter. Ferrothorn is pretty good at this, since it’s 4x weakness to Fire is not as tempting in the rain. Now you just have to worry about 2x effective Fighting and Fire. That makes it hard to hit for big damage due to its defenses, and Fire is usually the most effective way to hit it, but in the rain you can’t exploit its Fire weakness as well.
Ferrothorn @ Rocky Helmet / Leftovers
Ability: Iron Barbs
EVs: 252 HP / 24 Atk / 84 Def / 148 SpD
Careful Nature
- Knock Off
- Stealth Rock
- Leech Seed
- Iron Head
The Rocky Helmet set scares most physical attackers away, so I have some EVs to Special Defense, since you’re going to be hit by special moves most of the time. The Leftovers set is if you want to do the Leech Seed + Leftovers combo twice. 252 HP gives it bulk on both sides of the spectrum, 24 Attack is for a bit of a power boost, 84 Defense is if you do go against a physical attacker, and 148 Special Defense + Careful lets you take special moves better. Knock Off cripples Pokémon that rely on items. Stealth Rock is for laying entry hazards, something the rest of your team doesn’t do. Leech Seed works well on both sets, especially the Rocky Helmet one, since it’s your only form of recovery. Iron Head is STAB, hitting Fairies.
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So, now you have Pelipper, Dracovish, Barraskewda, Jolteon, Ludicolo, and Ferrothorn. Now I’ll look over the sets of Pelipper and Dracovish.
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For Dracovish, the EVs aren’t preferable. Even though you have it planned to spam Fishious Rend in the rain and it’ll do enough damage without Attack EVs, all while making it bulkier, you don’t want to click Fishious Rend all of the time. Maybe you are up against a Dragon type, you’ll want to use Outrage (assuming it’s weak to Dragon, of course). It won’t do enough with those EVs. So I’d change it to 252 Attack EVs over 252 HP (I’m not going to post another set here, since this is a small change).
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You could go with more defense EVs on Pelipper over Speed EVs, it’s not really meant to be fast, the whole strategy is to lead with it and U-Turn out of there unless you have a good matchup. Maybe Roost on it? I’m not sure what move to replace with Roost though, since the moveset you have is pretty solid.
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So, I think this is it. You have good defenses in Ferrothorn and Ludicolo, good offenses in Jolteon, Dracovish, and Barraskewda, and a good rain setter in Pelipper.
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Oh, also, here’s the team all together (importable, so it doesn’t have the multiple options, change what you need).
Barraskewda @ Life Orb
Ability: Swift Swim
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Close Combat
- Liquidation
- Psychic Fangs
- Poison Jab
Jolteon @ Choice Specs
Ability: Volt Absorb
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Hidden Power [Ice]
- Volt Switch
- Thunder
- Shadow Ball
Ludicolo @ Leftovers
Ability: Rain Dish
EVs: 252 HP / 228 Def / 28 SpA
Bold Nature
IVs: 0 Atk
- Scald
- Giga Drain
- Leech Seed
- Protect
Ferrothorn @ Rocky Helmet
Ability: Iron Barbs
EVs: 252 HP / 24 Atk / 84 Def / 148 SpD
Careful Nature
- Knock Off
- Stealth Rock
- Leech Seed
- Iron Head
Dracovish @ Choice Scarf
Ability: Strong Jaw
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Fishious Rend
- Psychic Fangs
- Outrage
- Crunch
Pelipper @ Damp Rock
Ability: Drizzle
EVs: 248 HP / 232 Def / 28 SpA
Bold Nature
- Defog
- U-turn
- Hurricane
- Scald
Hope this helps! :)
